Jamie Grier created FLINK-4391:
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             Summary: Provide support for asynchronous operations over streams
                 Key: FLINK-4391
                 URL: https://issues.apache.org/jira/browse/FLINK-4391
             Project: Flink
          Issue Type: New Feature
          Components: DataStream API
            Reporter: Jamie Grier


Many Flink users need to do asynchronous processing driven by data from a 
DataStream.  The classic example would be joining against an external database 
in order to enrich a stream with extra information.

It would be nice to add general support for this type of operation in the Flink 
API.  Ideally this could simply take the form of a new operator that manages 
async operations, keeps so many of them in flight, and then emits results to 
downstream operators as the async operations complete.



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